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[pstl] Fix broken policy_traits and clean up unused code
https://llvm.org/PR47602 https://llvm.org/PR47601 Differential Revision: https://reviews.llvm.org/D97808
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@ -25,50 +25,13 @@ namespace __internal
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using namespace __pstl::execution;
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/* predicate */
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template <typename _Tp>
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std::false_type __lazy_and(_Tp, std::false_type)
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{
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return std::false_type{};
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}
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template <typename _Tp>
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inline _Tp
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__lazy_and(_Tp __a, std::true_type)
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{
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return __a;
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}
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template <typename _Tp>
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std::true_type __lazy_or(_Tp, std::true_type)
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{
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return std::true_type{};
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}
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template <typename _Tp>
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inline _Tp
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__lazy_or(_Tp __a, std::false_type)
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{
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return __a;
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}
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/* iterator */
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template <typename _IteratorType, typename... _OtherIteratorTypes>
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struct __is_random_access_iterator
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{
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static constexpr bool value = __internal::__is_random_access_iterator<_IteratorType>::value &&
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__internal::__is_random_access_iterator<_OtherIteratorTypes...>::value;
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typedef std::integral_constant<bool, value> type;
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};
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template <typename _IteratorType>
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struct __is_random_access_iterator<_IteratorType>
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: std::is_same<typename std::iterator_traits<_IteratorType>::iterator_category, std::random_access_iterator_tag>
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struct __is_random_access_iterator
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: std::is_same<typename std::iterator_traits<_IteratorType>::iterator_category,
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std::random_access_iterator_tag>
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{
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};
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/* policy */
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template <typename Policy>
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struct __policy_traits
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{
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@ -77,39 +40,35 @@ struct __policy_traits
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template <>
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struct __policy_traits<sequenced_policy>
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{
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typedef std::false_type allow_parallel;
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typedef std::false_type allow_unsequenced;
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typedef std::false_type allow_vector;
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typedef std::false_type __allow_parallel;
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typedef std::false_type __allow_unsequenced;
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typedef std::false_type __allow_vector;
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};
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template <>
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struct __policy_traits<unsequenced_policy>
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{
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typedef std::false_type allow_parallel;
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typedef std::true_type allow_unsequenced;
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typedef std::true_type allow_vector;
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typedef std::false_type __allow_parallel;
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typedef std::true_type __allow_unsequenced;
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typedef std::true_type __allow_vector;
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};
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template <>
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struct __policy_traits<parallel_policy>
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{
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typedef std::true_type allow_parallel;
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typedef std::false_type allow_unsequenced;
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typedef std::false_type allow_vector;
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typedef std::true_type __allow_parallel;
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typedef std::false_type __allow_unsequenced;
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typedef std::false_type __allow_vector;
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};
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template <>
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struct __policy_traits<parallel_unsequenced_policy>
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{
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typedef std::true_type allow_parallel;
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typedef std::true_type allow_unsequenced;
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typedef std::true_type allow_vector;
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typedef std::true_type __allow_parallel;
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typedef std::true_type __allow_unsequenced;
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typedef std::true_type __allow_vector;
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};
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template <typename _ExecutionPolicy>
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using __collector_t =
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typename __internal::__policy_traits<typename std::decay<_ExecutionPolicy>::type>::__collector_type;
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template <typename _ExecutionPolicy>
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using __allow_vector =
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typename __internal::__policy_traits<typename std::decay<_ExecutionPolicy>::type>::__allow_vector;
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@ -123,41 +82,21 @@ using __allow_parallel =
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typename __internal::__policy_traits<typename std::decay<_ExecutionPolicy>::type>::__allow_parallel;
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template <typename _ExecutionPolicy, typename... _IteratorTypes>
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auto
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typename std::conjunction<__allow_vector<_ExecutionPolicy>,
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__is_random_access_iterator<_IteratorTypes>...>::type
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__is_vectorization_preferred(_ExecutionPolicy&& __exec)
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-> decltype(__internal::__lazy_and(__exec.__allow_vector(),
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typename __internal::__is_random_access_iterator<_IteratorTypes...>::type()))
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{
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return __internal::__lazy_and(__exec.__allow_vector(),
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typename __internal::__is_random_access_iterator<_IteratorTypes...>::type());
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return {};
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}
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template <typename _ExecutionPolicy, typename... _IteratorTypes>
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auto
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typename std::conjunction<__allow_parallel<_ExecutionPolicy>,
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__is_random_access_iterator<_IteratorTypes>...>::type
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__is_parallelization_preferred(_ExecutionPolicy&& __exec)
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-> decltype(__internal::__lazy_and(__exec.__allow_parallel(),
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typename __internal::__is_random_access_iterator<_IteratorTypes...>::type()))
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{
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return __internal::__lazy_and(__exec.__allow_parallel(),
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typename __internal::__is_random_access_iterator<_IteratorTypes...>::type());
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return {};
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}
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template <typename policy, typename... _IteratorTypes>
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struct __prefer_unsequenced_tag
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{
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static constexpr bool value = __internal::__allow_unsequenced<policy>::value &&
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__internal::__is_random_access_iterator<_IteratorTypes...>::value;
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typedef std::integral_constant<bool, value> type;
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};
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template <typename policy, typename... _IteratorTypes>
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struct __prefer_parallel_tag
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{
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static constexpr bool value = __internal::__allow_parallel<policy>::value &&
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__internal::__is_random_access_iterator<_IteratorTypes...>::value;
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typedef std::integral_constant<bool, value> type;
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};
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} // namespace __internal
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} // namespace __pstl
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